INDEX TO AMERICAN BOTANICAL LITERATURE 215 
Nelson, J. C. Does saximontanus mean “Rocky Mountain’? Rho- 
dora 22: 194, 195. 15 F 1921. 
Nelson, J.C. Notes on Scleropoa. Torreya 20: 119-122. 5 F 1921. 
Nutting, C. C. Is Darwin shorn? Sci. Mo. 12: 127-136. F 1920. 
Osler, H. S. Origin and development of pedigreed varieties of grain. 
Ann. Rep. Michigan Acad. Sci. 21: 139-143. Jl 1920. 
Overholts, L. O. Some New Hampshire fungi. Mycologia 13: 
24-37. 3 F 1921. 
Contains a list of 195 species. 
Palmer, E. L. A talk on winter weeds. Cornell Rural School Leafl. 
14:'165-220. Ja 1921. [Illust.] 
Pearson, W. H. Aplozia Pendletonii Pearson. Bryologist 23: 84, 85. 
1-3. 8F 1921. 
Pennuia: W. H. Porella rivularis fons | Lindb. Bryologist 23: 
Ba80. ix o P1021, 
Pease, V. A. Taxonomy and morphology of the ligulate species of the 
genus Desmarestia. Publ. Puget Sound Biol. Sta. 2: 313-367. 
pl. 54-63. 30D 1920 
Pegram, W. H., Wilson, R. U., & Patterson, A.H. James Jacob Wolfe. 
Jour. Elisha Mitchell Sci. Soc. 36: 110-114. 1921. [With portrait.] 
Pfeiffer, H. Cariceae Brasilienses maxime e civitate Parana a P. 
Dusén reportatae. Repert. Sp. Nov. Regn. Veg. 17: 28-32. 
I Ja 1921 ‘ 
Includes 2 new species. 
Piper, C. V. Plants and plant culture. Science II. 53: 269-279. 25 
Mr 1921. 
Porsild, M. P. The structure and biology of Arctic flowering plants. 
14. Liliales. Meddel. Grénland 37: 343-358. f. 1-8. 1920. 
Purpus, J. A. Echinopsis caespitosa J. A. Purpus spec. nov. Monatsschr. 
Kakteenk. 27: 120. Au19t7.  [Illust.] 
Species from Bolivia. 
Quehl, L. Kultur und Kulturgebnisse. -Monatsschr. Kakteenk. 26: 
105-109; 125-127. 1916. 
Describes flowers and fruits of various Cactaceae. 
Quehl, L. Echinocactus grandis Bone Monatsschr. Kakteenk. 27: 
86. Je 1917. 
Quehl, L. Mamillaria bombycina Quehl. Monatsschr. Kakteenk. 26: 
50. Ap FG16. 
Quehl, L. Mamillaria Buchheimiana Quehl spec. nov. . Monatsschr. 
Kakteenk. 27: 97-99. Jl 1917. 
